Journal
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
Volume 40, Issue -, Pages 54-63Publisher
JOURNAL MATER SCI TECHNOL
DOI: 10.1016/j.jmst.2019.08.044
Keywords
Inconel 718 superalloy; Isothermal compression bonding; Dynamic recrystallization; Grain boundary; Subgrain; Strain rate
Funding
- National Key Research and Development Program [2018YFA0702900]
- National Natural Science Foundation of China [U1508215, 51774265]
- National Science and Technology Major Project of China [2019ZX06004010]
- Key Program of the Chinese Academy of Sciences [ZDRW-CN-2017-1]
- Program of CAS Interdisciplinary Innovation Team
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Plastic deformation bonding (PDB) has emerged as a promising solid state bonding technique with limited risk of phase transformations and residual thermal stresses in the joint. In this study, the PDB behavior of IN718 superalloy was systematically investigated by performing a series of isothermal compression tests at various processing conditions. It was revealed that, with increasing PDB strain rate at 1000 degrees C, different extents of dynamic recrystallization (DRX) occur in the bonding area of IN718 joints. The extent of DRX, average size of DRXed grains, and a newly proposed interfacial bonding ratio (Psi(Bonding)) parameter (to quantify the bond quality) were initially reduced with increase in the strain rate up to 0.1 s(-1) and later increased at further higher strain rates. Electron backscattered diffraction (EBSD) and transmission electron microscopy (TEM) based interfacial microstructure analyses indicated that the quality of the bonded joints is closely related with the development of fine DRXed grains at the bonding interface with the increasing strain, which promotes adiabatic temperature rise. It was revealed that the initial bulging and subsequent migration of the original interfacial grain boundary (IGB) were the main mechanisms promoting DRX in the well bonded IN718 superalloy joints. Moreover, the mechanical properties of the bonded joints were not only controlled by the recrystallized microstructure but also depended upon the Bonding parameter of the joints. (C) 2019 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
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